数学口算练习
日期:分秒
7+78=62+18=59+22=
91-54=37-18=31-13=
71+19=58+26=74+17=
97-29=84-49=85-17=
54+29=38+33=7+19=
42-18=56-19=44-25=
59+26=89+8=37+16=
86-58=95-16=98-93=
13+17=30+30=42+58=
54-26=37-9=89-81=
23+39=61+19=37+40-38=26-7=73-54=30-27+13=67+13=69+11=72+20-81=45-8=48-29=84-46+10=10+30=42+28=74+11-73=37-19=95-67=75-68+42=71+19=58+16=13+40-24=22-9=45-26=27-8+21=3+37=39+13=7+81-60=43-18=92-79=56-18+35=